World 2-Haunted House

Star Coins

Star Coin 1

A short time after Boohemoth starts chasing you, you'll find a blue/purple block that moves left and right. Jump on it and wait until it is all the way to the right. From here, wall jump up and off the screen, fall to the right and grab the first Star Coin. Alternatively, turn to face Boohemoth from the platform to the right of the coin, then run and leap up to the left. You'll have to be quick to get out before Boohemoth arrives, mind.

Star Coin 2

Shortly after that, there's a platform that falls slowly when you stand on it. Wait until it goes all the way down - remembering to face Boohemoth so he doesn't advance too far - and you simply need to jump up to the ledge to grab the second Star Coin.

Star Coin 3

A little later on, the ground will turn into a trampoline, bouncing Mario up into the air. The last Star Coin is at the very top of the screen, flying around in a circle. There are 5 coins lined up vertically to guide you, though you might find you bounce into it by happy accident. Note: You cannot get the last Star Coin as regular Mario.

Secret Exit to World 2-B

A little way beyond the second Star Coin you will see two pillars. On the left side of the pit, there is a hidden block containing a beanstalk. Climb up to find the secret exit.